Electrical distribution system



Feb. 14, 1939- w. H FRANK ET AL ELECTRICAL DISTRIBUTION SYSTEM Original Filed Oct.

' INVENTO BY MQUTORNEY.

Patented Feb. 14, 1939 uNirsosrATEs PATENT OFFICE 2,146,812 ELECTRICAL DISTRIBUTION SYSTEM William H. Frank and Joseph W. Harper, Detroit, Mich, assignors to Bulldog Electric Products Company, Detroit, Mich a. corporation of West Virginia Original application October 9, 1933, Serial No. 692,910, now Patent No. 2,041,675, dated May 19,

1936. Divided and this application January 29, 1936, Serial No. 61,290

4 Claims. (Cl. 247-3) This application relates to electrical distribumay be connected to the wiring space through tion systems of the bus duct and plug type and is any one of three walls |20l20-l22 and at a. divisional of our prior application Serial No. spaced points. 692,910 of October 9, 1933 now Patent #1041575, The plug-in devices P4, are provided with pull May 19,1936. out handles 128 which aid in moving the plug-in 5 One of the features of the system herein disdevices to and from the duct run for switching closed is a supplementary duct construction. The action, after the clips 12'! are rotated for release. duct is formed of two pans or halves joined by We claim: means of side flanges and containing bus bars, 1. A bus duct system comprising a duct having and in the construction herein disclosed the lower bus bars therein, and provided with large holes in 10 pan is equipped with hingedly mounted plugs a Wall thereof, branch circuit conductors outside whose prongs are adapted to make contact with the duct and having terminals entering the duct the bus bars, the plugs partially filling the lower hr h holes ot r th n h r e holes aforepan, The bal n e f th lower pan i u d as mentioned, the terminals having flexible portions 1 conductor gutter and also as a connection means Within the duct, branch it pl s within he 15 for branch circuit d t duct and filling said large holes and providing Still further features of construction will be covers therefor d having on a t for en a readily apparent upon reference t t appended ing the bus bars, the flexible conductor portions drawing. In th drawi Within the duct being connected within the duct Fig. 1 is a fragmentary side elevational view or to the plug Cmtacts- 20 an electrical distribution system, shown with cur A bus duel; System comprising a uc aving rent take-0E d vi i m bus bars therein, and provided with large holes Fig, 2 is a secti l i as if on line g 2 of in a wall thereof, branch circuit conductors out- Fig. 1. side the duct and having terminals entering the In Figs. 1 and 2, there is shown a d t run duct, through holes other than the large holes 25 which includes 9, casing whose upper part, is a aforementioned, the terminals having flexible flanged pan 29, and whose lower part includes Portions Within the duct, branch Circuit plugs two separated side plates 120, having flanged within the duct and filling said large holes and edges i2l secured to the flanged edges ii of the Providing Covers therefor and having e s upper casing part 20 by b lt 23 passed through for engaging the bus bars, the flexible conductor 39 the flanges ll-HI. At intervals, the lower porportions within the duct being connected within tions of these plates 120 are connected by lower the duct to the P centects, the plugs be and intermediate cross plates V22, :23, bolted to hihgedly mounted t0 the duct y hinges t the the side plates 120, the space between the cross d e of sa large holes thereof w by ey plates and the side plates being in the nature of y be s into and out Of the (111012 35 a. wiring space. The plates a2u |22, at suitable 3- A s duct y m comprising a t h vin points, are provided with removable knock-outs bus bars therein, and provided with large holes 123a at these wiring spaces, through which may in a wall thereof, branch circuit conductors outbe introduced branch circuit rigid conduits l2d side the duct and having terminals entering the 40 whose cables I25 pass into' the wiring spaces, duct, through holes other than the large holes Hingedly secured to the plates 122 at their edges aforementioned, the terminals having flexi e I26 are plug-in devices Pt having contact arrangeportions within the duct, branch circuit plugs ments 94 for engagement with bus bars 24 in the within the duct nd il n ai l r e holes and duct run, and these plug-in devices bridge the providing covers therefor and having contacts for gaps between the longitudinally spaced plates l22, engaging the bus bars, the flexible conductor por- 45 and form with these plates, a continuous bottom tions within the duct being connected within the closure for the wiring space through which the duct to the plug contacts, the exposed surfaces wires 125 from the rigid conduits I24 pass to the of the plugs, when these are within the duct, be-= plug-in devices P4. Rotatable clips 121 aid in ing substantially flush with that wall of the duct maintaining the plugs P6 in place in the duct provided with the plug receiving holes.

run. i. A bus duct system comprising a duct having The construction of Figs. 1--2 may be regarded bus bars therein, and provided with large holes in as a combined bus bar and wiring duct construca wall thereof, branch circuit conductors outside tion. the duct and having terminals entering the duct,

It will be observed that the rigid conduits 12% through holes other than the large holes aforementioned, the terminals having flexible portions within the duct, branch circuit plugs within the duct and filling said large holes and providing covers therefor and having contacts for engaging the bus bars, the flexible conductor portions within the duct being connected within the duct to the plug contacts, the plugs being hingedly mounted to the duct by hinges at the edges of said large holes thereof whereby they may be swung into and out of the duct, the exposed surfaces of the plugs, when these are within the duct, being substantially flush with that wall of the duct provided with the plug receiving holes.

H. FRANK. JOSEPH w. m. 

